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rsync 3.2.3

    1: /*
    2:  * Simple byteorder handling.
    3:  *
    4:  * Copyright (C) 1992-1995 Andrew Tridgell
    5:  * Copyright (C) 2007-2020 Wayne Davison
    6:  *
    7:  * This program is free software; you can redistribute it and/or modify
    8:  * it under the terms of the GNU General Public License as published by
    9:  * the Free Software Foundation; either version 3 of the License, or
   10:  * (at your option) any later version.
   11:  *
   12:  * This program is distributed in the hope that it will be useful,
   13:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   14:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15:  * GNU General Public License for more details.
   16:  *
   17:  * You should have received a copy of the GNU General Public License along
   18:  * with this program; if not, visit the http://fsf.org website.
   19:  */
   20: 
   21: #undef CAREFUL_ALIGNMENT
   22: 
   23: /* We know that the x86 can handle misalignment and has the same
   24:  * byte order (LSB-first) as the 32-bit numbers we transmit. */
   25: #if defined __i386__ || defined __i486__ || defined __i586__ || defined __i686__ || __amd64
   26: #define CAREFUL_ALIGNMENT 0
   27: #endif
   28: 
   29: #ifndef CAREFUL_ALIGNMENT
   30: #define CAREFUL_ALIGNMENT 1
   31: #endif
   32: 
   33: #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
   34: #define UVAL(buf,pos) ((uint32)CVAL(buf,pos))
   35: 
   36: #if CAREFUL_ALIGNMENT
   37: 
   38: static inline uint32
   39: IVALu(const uchar *buf, int pos)
   40: {
   41: 	return UVAL(buf, pos)
   42: 	     | UVAL(buf, pos + 1) << 8
   43: 	     | UVAL(buf, pos + 2) << 16
   44: 	     | UVAL(buf, pos + 3) << 24;
   45: }
   46: 
   47: static inline void
   48: SIVALu(uchar *buf, int pos, uint32 val)
   49: {
   50: 	CVAL(buf, pos)     = val;
   51: 	CVAL(buf, pos + 1) = val >> 8;
   52: 	CVAL(buf, pos + 2) = val >> 16;
   53: 	CVAL(buf, pos + 3) = val >> 24;
   54: }
   55: 
   56: static inline int64
   57: IVAL64(const char *buf, int pos)
   58: {
   59: 	return IVALu((uchar*)buf, pos) | (int64)IVALu((uchar*)buf, pos + 4) << 32;
   60: }
   61: 
   62: static inline void
   63: SIVAL64(char *buf, int pos, int64 val)
   64: {
   65: 	SIVALu((uchar*)buf, pos, val);
   66: 	SIVALu((uchar*)buf, pos + 4, val >> 32);
   67: }
   68: 
   69: #else /* !CAREFUL_ALIGNMENT */
   70: 
   71: /* This handles things for architectures like the 386 that can handle alignment errors.
   72:  * WARNING: This section is dependent on the length of an int32 (and thus a uint32)
   73:  * being correct (4 bytes)!  Set CAREFUL_ALIGNMENT if it is not. */
   74: 
   75: static inline uint32
   76: IVALu(const uchar *buf, int pos)
   77: {
   78: 	union {
   79: 		const uchar *b;
   80: 		const uint32 *num;
   81: 	} u;
   82: 	u.b = buf + pos;
   83: 	return *u.num;
   84: }
   85: 
   86: static inline void
   87: SIVALu(uchar *buf, int pos, uint32 val)
   88: {
   89: 	union {
   90: 		uchar *b;
   91: 		uint32 *num;
   92: 	} u;
   93: 	u.b = buf + pos;
   94: 	*u.num = val;
   95: }
   96: 
   97: static inline int64
   98: IVAL64(const char *buf, int pos)
   99: {
  100: 	union {
  101: 		const char *b;
  102: 		const int64 *num;
  103: 	} u;
  104: 	u.b = buf + pos;
  105: 	return *u.num;
  106: }
  107: 
  108: static inline void
  109: SIVAL64(char *buf, int pos, int64 val)
  110: {
  111: 	union {
  112: 		char *b;
  113: 		int64 *num;
  114: 	} u;
  115: 	u.b = buf + pos;
  116: 	*u.num = val;
  117: }
  118: 
  119: #endif /* !CAREFUL_ALIGNMENT */
  120: 
  121: static inline uint32
  122: IVAL(const char *buf, int pos)
  123: {
  124: 	return IVALu((uchar*)buf, pos);
  125: }
  126: 
  127: static inline void
  128: SIVAL(char *buf, int pos, uint32 val)
  129: {
  130: 	SIVALu((uchar*)buf, pos, val);
  131: }
  132: